#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<stdlib.h>

int main()
{
    printf("Before: pid is %d\n",getpid());
    pid_t id = fork();
    if(id == -1)
    {
        perror("fork()");
        exit(1);
    }
    printf("After :pid is %d, fork return %d\n",getpid(),id);
    sleep(1);
    
    return 0;
}
